Trusted by 1,100+ publications
Power Analysis Without the Programming
Enter parameters. Get instant results. Export for your protocol. No R installation, no code, no complexity.
1,100+ Citations
668 Calculators
440+ Scenarios
Start Free
Endocrine and Autonomic Systems
Cell
A circadian clock in the blood-brain barrier regulates xenobiotic efflux
Epidemiology
Medicine
Motor development delay in offspring is associated with prenatal telbivudine exposure
Public Health, Environmental and Occupational Health
Medicine
Effect of laser acupuncture on dry eye
Orthopedics and Sports Medicine
Medicine
Serum glutathione peroxidase 4 as a novel biomarker for nontraumatic osteonecrosis of the femoral head: A retrospective case-control study
Molecular Biology
Medicine
Evaluating the potential of GSPT2 and CIRBP as biomarkers in endometrial cancer: Multicenter RT-PCR and IHC study
Endocrine and Autonomic Systems
Cell metabolism
Defined Paraventricular Hypothalamic Populations Exhibit Differential Responses to Food Contingent on Caloric State
Physiology
Cell metabolism
Dissociation of Adaptive Thermogenesis from Glucose Homeostasis in Microbiome-Deficient Mice
Orthodontics
Materials
Repair Bond Strength of Conventionally and Digitally Fabricated Denture Base Resins to Auto-Polymerized Acrylic Resin: Surface Treatment Effects In Vitro
Immunology
iMeta
Gut microbiota‐derived tryptophan metabolites improve total parenteral nutrition‐associated infections by regulating Group 3 innate lymphoid cells
Social Psychology
Nature Neuroscience
Oxytocin-receptor-expressing neurons in the parabrachial nucleus regulate fluid intake
Molecular Biology
Nature neuroscience
Differentiation of human pluripotent stem cells into neurons or cortical organoids requires transcriptional co-regulation by UTX and 53BP1
Molecular Biology
Nature Communications
Epigenomic profiling of primary gastric adenocarcinoma reveals super-enhancer heterogeneity
library(pwr)
result <- pwr.t.test(
n = 50,
d = 0.5,
sig.level = 0.05,
type = "two.sample"
)
No R or Python installation
No code writing required
Publication-ready plots
Export tables to CSV
No IT approval needed
Weeks of time saved
Plot Table Summary
Interactive power curve. See exactly how power changes as you vary sample size, with separate lines for each effect size. Hover for exact values. Export as PNG or SVG.
Sortable results table. Every combination of parameters in one view. Sort by any column, hide columns you don't need, export to CSV, or copy to clipboard.
Copy-paste summary statement. A plain-English description of your analysis, ready for your protocol, grant application, or manuscript methods section.
Sensitivity Analysis
Explore how power changes across parameter ranges using intuitive R expressions.
Transparent Mathematics
Every calculation backed by peer-reviewed R packages with documented methodology.
Protocol-Ready Output
Generate summary statements suitable for clinical protocols and grant applications.
Citable Results
Shareable URLs for reproducibility. Cite with confidence in publications.
T-Tests
One-sample, two-sample, and paired designs
ANOVA
One-way, two-way, and repeated measures
Proportions
Chi-square, Fisher's exact, and binomial tests
Survival Analysis
Log-rank, Cox regression, and time-to-event
Equivalence & NI
Non-inferiority, equivalence, and TOST designs
Regression
Linear, logistic, and multiple regression
Cluster RCTs
Cluster randomized controlled trials
Epidemiology
Case-control, cohort, and SCCS designs
Ready to Design Your Study?
24 core calculators on the free tier with a free account. Upgrade for the full library.
Get Notified of New Calculators
We're adding new power analysis tools regularly. Be the first to know.